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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2681f121f04a5734cf52bf7286a673356cc736ab9a6ce74b1f5cf3d40d97a5b6' 
  AND token = 'i2BqnK+/8vTrd4b1WhQGG0xz6Lw15SvAS4XtfeSbBh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}